Greenheck DGX Installation, Operation And Maintenance Manual page 4

Installation - Arrangement DB / HZ
Step 1 Install Curb and/or Equipment
Support(s)
Position curb/equipment support(s) on the roof
(reference the CAPS submittal for placement of
curb/equipment support(s) in relation to the unit).
Verify that unit supports are level, shim if necessary.
Attach curb to roof and flash into place. Attach the
equipment support(s) to the roof, remove metal cover,
flash to wooden nailer and reinstall cover. Refer to
figure #3.
Step 2 Install Ductwork
Good duct practices should be followed for all
ductwork. All ductwork should be installed in
accordance with SMACNA and AMCA guidelines,
NFPA 96 and all local codes. Reference the CAPS
submittal for ductwork sizes. See figure #4.
Step 3 Apply Sealant
Apply an appropriate sealant around the perimeter of
the curb and duct adapter(s) to isolate fan vibration
and prevent water penetration. See figure #4.
Step 4 Install Unit
Use a crane and a set of spreader bars hooked to the
factory lifting lugs to lift and center the unit on the
curb/equipment support(s). See figure #5.
Use self-tapping sheet metal screws to fasten the unit
to the curb/equipment support(s).
NOTE!
The use of all lifting lugs and a set of spreader
bars is mandatory when lifting the unit.
NOTE!
Some units come with the weatherhood attached
and step 5 may not apply.
Step 5 Assemble and Attach
Weatherhood
The weatherhood can now be assembled and
attached to the unit. Detailed assembly instructions
can be found with the weatherhood. If the optional
evaporative cooling module was selected, this step
does not apply, refer to the installation instructions for
the optional evaporative cooling module.
Step 6 Seal Weatherhood Seam
Using an appropriate sealant, seal the seam between
the weatherhood and the unit.
Metal Cover
Equipment
Support
Figure 3. Roof Curb
NOTE!
The use of a duct adapter is recommended on a
downblast (DB) arrangement to align the
ductwork with the supply unit and is only a guide
and is not to be used as support for the
ductwork.
Optional Return Air Duct
(Arrangement HZ and DB)
Figure 4. Duct Work
Figure 5. Placing Unit
Figure 6. Complete Rooftop Installation
4
Roof Curb
Supply Air Duct Work
(Arrangement DB only)
Sealant